Related by context. Frequent words. (Click for all words.) 46 groundwater 45 contaminants 43 groundwater contamination 41 contaminant 41 contaminated groundwater 41 seepage 41 wastewater discharges 39 contamination 39 aquifer 39 Creek tributary 39 aquifers 39 contaminated soil 38 leachate 38 wastewater 37 hydrogen sulfide 37 reservoir 37 soils 37 hydrogeologist 37 contaminated soils 37 arsenic contamination 37 hydrology 36 underground aquifers 36 coal slurry 36 arsenic 36 sediment 36 Raw sewage 36 wells 36 effluent 35 Groundwater 35 underground aquifer 35 septic systems 35 watersheds 35 pollutants 35 raw sewage 35 sediments 35 Contamination 35 septic tanks 35 spillages 35 subsurface 35 pollutant 34 water 34 fracking 34 Perchlorate 34 DEQ 34 radionuclides 34 Aquifer 34 treated effluent 34 fecal contamination 34 hexavalent chromium 34 sludge 34 ADEQ 34 spillage 34 chlorine 34 tritium 34 sewage 33 seeps 33 slurry 33 Superfund site 33 leaching 33 septic 33 dewatering 33 seeping 33 outfall 33 chlorides 33 stormwater runoff 33 perchlorate 33 reservoirs 33 turbidity 32 fly ash 32 saltwater intrusion 32 Safe Drinking Water 32 toxic chemicals 32 trichlorethylene 32 basins 32 wastewater discharge 32 fecal coliform 32 Environmental Quality 32 fecal coliform bacteria 32 methane 32 PCB contamination 32 lagoons 32 suspended solids 32 nitrates 32 watercourse 32 biosolids 32 tailings 31 Edwards Aquifer 31 spills 31 sewage sludge 31 seawater 31 OEPA 31 sedimentation 31 nitrate 31 potable 31 wastewater treatment 31 seep 31 sump 31 polluted runoff 30 EBMUD 30 sewage spills 30 mine tailings